Citric acid

• Formula: C₆H₈O₇
• Molecular weight: 192.1235
• IUPAC Standard InChI: InChI=1S/C6H8O7/c7-3(8)1-6(13,5(11)12)2-4(9)10/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12) Copy

  
• IUPAC Standard InChIKey: KRKNYBCHXYNGOX-UHFFFAOYSA-N Copy
• CAS Registry Number: 77-92-9
• Chemical structure:
  This structure is also available as a 2d Mol file
• Other names: 1,2,3-Propanetricarboxylic acid, 2-hydroxy-; Aciletten; Citretten; Citro; 2-Hydroxy-1,2,3-propanetricarboxylic acid; β-Hydroxytricarballylic acid; Anhydrous citric acid; Citric acid, anhydrous; Kyselina citronova; Kyselina 2-hydroxy-1,2,3-propantrikarbonova; 3-Carboxy-3-hydroxypentane-1,5-dioic acid; Chemfill; F 0001 (polycarboxylic acid); Hydrocerol A; NSC 30279; NSC 626579; K-Lyte DS (Salt/Mix); K-Lyte (Salt/Mix); Citraclean (Salt/Mix); K-Lyte/Cl (Salt/Mix)
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• Information on this page:
  • Condensed phase thermochemistry data
  • References
  • Notes
• Other data available:
  • Phase change data
  • Henry's Law data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • UV/Visible spectrum
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Condensed phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Constant pressure heat capacity of solid

References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Wilhoit and Shiao, 1964
Wilhoit, R.C.; Shiao, D., Thermochemistry of biologically important compounds. Heats of combustion of solid organic acids., J. Chem. Eng. Data, 1964, 9, 595-599. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

De Kruif, Van Miltenburg, et al., 1982
De Kruif, C.G.; Van Miltenburg, J.C.; Sprenkels, A.J.J.; Stevens, G., Thermodynamic properties of citric acid and the system citric acid-water, Thermochim. Acta, 1982, 58, 341-354. [all data]

Notes

Go To: Top, Condensed phase thermochemistry data, References

• Symbols used in this document:
  

  Cp,solid	Constant pressure heat capacity of solid
  S°solid,1 bar	Entropy of solid at standard conditions (1 bar)
  ΔcH°solid	Enthalpy of combustion of solid at standard conditions
  ΔfH°solid	Enthalpy of formation of solid at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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